-95.86% is the change from 507 to 21
Calculation steps:
[( 21 - 507 ) ÷ 507] x 100 = -95.86%
Formula
Percentage change = [(21 - 507) / 507] x 100
Subtract the new number by the original number
21 - 507 = -486
-486 ÷ 507 = -0.9585798816568047
-0.9585798816568047 x 100 = -95.86%